CouchDB's current built in replication doesn't have the concept of sharing partial data yet. It currently push/pulls everything in a single Database. Converse

CouchDB's current built in replication doesn't have the concept of sharing partial data yet. It currently push/pulls everything in a single Database. Conversely it's also a trivial thing to create a new database, so one database per user would certainly be possible. Also as the project develops that is functionality that is intended to be there.